Lath-board



s. M. FORD.

v LATH BOARD. APPLIQATION FILED MAR- 24. 1916.

1,194,008. I PatentedAug. 8,1916.

SILAS M. FORD, OF ST. PAUL, MINNESOTA.

LATE-BOARD.

To all whom it may concern: Q

Be it known that I SILAS M. Form", a citif zen of the United tates,residing at St.

flexible sheeting corrugated to form lath likeprojections andintermediate depressions or valleys, and designed .to be fastened to thestudding or beams of buildings to serve as a foundation for plaster, sothat the depressions' or valleys on the underside of the board will formdead air spaces while the valleys on its plastering facewill formplaster receiving spaces. It is desirable tomake the board in largesheets which can be rolled or packed for shipping and afterward cut tothe size and shape desired in use.

It is the object of the invention to provide improved means for bracingand protecting the corrugations from being crushed or flattened inhandling and use, and also for binding them together so that they willnot spread apart, w1th the consequent impairment of their capacity asdead air spaces or plaster receiving spaces.

With these objects in view I have provided strips arranged transverselyof the board and carrying at intervals prongs which project down throughthe board portions at the bottom of the valleys and are 85 formed withlateral shoulders -which bear against the upper faces of said boardportions so as to form strut-like supports. The struts are preferablypositioned so as to resist the lateral thrust of the projections 40 whenthe same are under pressure.

More. particularly the invention consists in the construction,combination, and arrangement of parts hereinafter described and claimed.

In the accompanying drawings forming part of this specification, Figure1 is a perspective view of a fragment of lath-board embodying thepresent invention; Fig. 2 1S anend view of the same, Fig. 3 is an endview of a fragment of the same shown pro vided with a backing sheet; andFig. 4 is a erspective view of'a binding strip embodymg the inventiona 4The lath-board which is the sub ect of 65 this invention is made offlexible sheeting,

Specification of Letters Patent.

Patented Aug. 8, 1916.

Application filed march 24,1916. Serial No. 86,411.

' preferably waterproofed paper, pressed or molded to form corrugationsor alternate pro ectlons and depressions or valleys, so that theprojections on one side will form the valleys on the' other and viceversa'. The corrugations are preferably of plait-like keyed-lath shape,that is of the shape of a lath having keyed or inwardly extending sides,as-shown in the drawings, where 22 represent the lath projections on theouter face of the board, and 33 the valleys or depressions between them.These depressi'ons are formed by stamping out the lath projections 4 onthe inner face of the board,

and there are similar depressions or valleys 5 between the lathprojections 4, these valleys being formed by stamping up the projections2. The valleys or longitudinal channels 3 which are open on the outer orplastering face of the board serve as plaster receiving spaces, whilethe oppositely facing valleys or channels 5 under the hollow stamped uplath projections 2 serve as dead air heat insulating and sound deadeningspaces. v

To brace and protect the corrugations from becoming crushed or spreadapart in handling and use, I have provided sheet metal strips 6 whichare arranged transversely of the corrugations and preferably extendacross the face of the same at suitable intervals apart. These stripsare secured to the board by means of struts 7 which project down throughthe bottom portions of the board and are formed with lateral shouldersor knees 8 in position to abut or bear against the upper faces of saidbottom board portions. Below the shoulders the struts terminate inprongs 9 which pierce and extend through the bottom portions of theboard and are bent or clenched over against the under side of the same.The struts are preferably integral or fast with the binding strips 6 andstamped out of the strips themselves, as shown in the drawings. They arealso preferably formed with lateral arms 10 bent up at the shoulders soas to bear against the upper face of the bottom board portion. Where thecorrugated board is formed with a backing sheet on the underside, asshown at 11 in Fig. 3, the prongs of the struts may extend through thlssheet and be bent over or clenched upon the under side of thesame.

It will be evident that when a weight is 110 laid, or pressure isexerted, upon the strips,

the thrust will be received and resisted by the struts, which will thusrelieve the projections and folds of the board from pressure, andprevent them from being crushed,

while the struts, when they confine the pro- I jections at-the sides, aswould usually be the extending down through the bottom portions of theboard and being formed with lateral shoulders in position to bearagainst the upper face ofsaid bottom boardiportion whereby to formstruts between said strips and said board portions.

2. A lath-board comprising a sheet of flexible :material corrugated toform keyed, lath shaped projections and intermediate depressions, stripsarranged transverselyof the projections, and struts securing the stripsto the board at intervals, said struts extending down at the side edgesof the projections and through the board portions at thetbottom of thedepressions, and being formed with lateral shoulders in position to bearagainst the upper faces of said bottom board portions.

' 3. A lath-board comprising a' sheet of flexible material corrugated toform interspaced lath projections and intermediate depressions, sheetmetal strips supported upon, and extending transversely across, thefaces of the projections, and struts carried by the strips at intervals,said struts extending down into the depressions and through the boardportions at the bottoms thereof, said struts being formed intermediatetheir length with lateral shoulders in position to bear against theupper faces of said bottom board portions.

4. A lath-board comprising a sheet of 4 fle'xiblematerial corrugated toform keyedlath shaped projections and intermediate depressions, saidprojections having inwardly inclined sides,.sheet metal strips supportedupon, and extending transversely across, the

faces of the projections, and struts carried by the strips at intervals,said struts extendingdown adjacent the side edges of the pro jectionsinto the depressions, between them and through the board portions at thebottom of the depressions, said struts being formed with lateralshoulders in position to bear against the upper faces of said bottomboard portions.

In testimony whereof I aflix my signature I in presence of twowitnesses.

. SILAS M.- FORD. Witnesses:

' ARTHUR P. Lo'rHRoP,

H. SwANsoN.

